Improvement in tubular-pumps for deep wells



fire. Meme-W MW- CHARLES H. DUNCAN, OF PITHOLE CITY, PENNSYLVANIA.

Letters Patent No. 89,134, dated April 20, 1869.

IMPROVEMENT IN TUBU'LAR-PUMPS FOR DEEP WELLS.

I The Schedule referred to in these Letters Patent'and making part of the eamo.

To all whom it I'may concern.

Be it known that I, Guantes H. DUNeAN, ot the borough ot'Pithole City, county of Venango, and State of Pennsylvania, have invented certain new and useful Improvemcntsin Pumps; and I do hereby declare that the following is a full, clear, and e'xact description thereof, reference being had to the accompanying drawings, which form a part of this specification, and in which- Figure l is a vertical longitudinal section, and

Figure 2, a transverse section thereof, on line A'B of fig. 1.

In pumping oil, and other artesian wells, the gas arising therefrom is a frequent source of annoyance and trouble, especially in wells which. do not yield a constant supply o f fluid, said gas havin g sufficient force, at times, to hold the lower pump-valve open during both the upward and downward stroke, and thus rendering the pump entirely inoperative.

The presence of more or less sand and mnd with the oil or water, also tends to clog thc valves,particularly the lower or iixed valve; and wells have not unfre- -quently been abandomnl, when, but for these annoyances, they would have produced in paying quantities.

-The object of my invention is to overcome said difficulties, by so arranging the pump that the lower, or ibut-valve shall be mechanically and instantly, opened and closed, by the alternate raising and lowering ofthe upper valve, either with or without the presence oi gas or Huid; and I also so arrange the several parts ofthe pumps that the wearing'suriace of the barrel, when worn out, can be readily removed, and replaced at pleasure.

' In the drawingsa represents the outer barrel, or casing ofthe pump, provided with'a collar at each end, for the attacln'neut ofthe tubing above., and the valve-seat below.

b is the upper, or working-valve, which may be of any suitable or desired form.

c is the lower, or foot-valve, which I make preferably with a stem, as shown. The precise shape of said lower valve is, however, immaterial to the present case.

My in'iprovement consists, mainly, in the addition or interposition ofthe inner movable tube 11placed between the outer pump-barrel a and the valves, and extending, from above the range of the upper valve, to or near the bottom ofthe pump.

Said tube l is fitted loosely within the barrel ct, serves as a workilig-barrel for the upper valve, and moves about threc-tburths of an inch with each stroke of the latter, between the seats o and f, and in a line parallel therewith, and carries with it the lower valve, the latter being attached thereto, or suspended therefrom by means ot' the bar and valve-stem, as shown, or in any suitable manner.

The lower valve-seat g is placedjust below the seat c of the tube, and I prefer to make them together, of a single piece of steel, as shown.

'lhe operation of the arrangement is as follows:

At the commencement of the upward stroke, thev t'rietion'of the upper valve upon the inner surface of the tube d, raises the latter, together with the lower valve, until it is stoppedby contact with the seat or shoulder f, where it remains at rest, While the upper valve completes the stroke, the lower valve, in the mean time, heilig held open or suspended by the tube d.

As soon as the upper valve commences to descend, it carries with it the tube d, and, through it, closes the lower valve.

It will thus be seen that the upper valve, through and by means of the tube d, mechanically opens and closes the lower valve at the commencement of each alternate stroke, and holds it open or closed, as the case may be, duringr the continuance of the stroke, without regard to the presence or absence of fluid or Sis- The lower valve c is suspended by its stem, from or within the lower end ofthe tube d, in such a position with relation to the latter, that, on the .downward stroke, 'the valve shall reach its seat just before the tube (lis seated, the valve having suicient vertical motion upon its stem to allow. forthe same.

A convenient and essential feature of my arrangement is, that, whenever the inner wearing-surface of the tube d becomes worn or out away, it can be readily removed by unscrewing the lower collar upon the barrel a, and a new tube may be inserted in its place without removing or changing the other parts of the pump.

I have represented said tube as made in two sections, screwed together, to allow ofthe convenient attachment or suspension of the lower valve, and also, of the removall or renewal of the worn portion.

Having thus described my improvements,

What I claim as my invention, and desire to secure by Letters Patent, is

1. The movable tube el, extending above and below the range ofthe upper valve,and carrying with it the lower valve, in combination with the outer barrel a, and seats or shoulders e and f, the whole operating substantially in the manner and for the purposes set forth.

2. The lower valve of a pump, attached or suspended to or within a movable inner barrel or tube, under such an arrangement of parts, that the friction of the upper 'valve upon said inner movable barrel or tube, shall effeet the opening and closing of said lower valve, substantially as set forth.

CHAS. H. DUNCAN.

A. B. HOWLAND, M. G. BENEDIGT. 

